- All patients must have a biopsy-proven indolent or diffuse large B-cell non-Hodgkin's lymphoma as defined as REAL classification marginal zone/MALT, mantle cell, plasmacytoid, lymphoplasmacytoid, small lymphocytic lymphoma or follicle center grades I, II, III or diffuse large B-cell (CLL patients will not be eligible); transformation from a low grade to intermediate or high grade lymphoma is also permissible; patients with diffuse large cell lymphoma must not be eligible for any known potentially curative therapy; at least one diagnostic pathologic specimen will be reviewed by the JHH Pathology Department